Yes they do talk.
Chess
Yes, After Jasper Finishes Explaining His Story To Bella I Think
in Eclipse, on page 287. the start of chapter 13.
not really, since jasper was in the southern wars, he was able to feed on humans whenever he wanted to, therefore he tries not to interact with Bella so he doesnt have to worry about killing her. But He does take a liking in Bella in eclipse and Breaking Dawn, Jasper has a sense of humour that is weird so he just makes jokes with her about being a horrible new born. He sees how important Bella is to Alice in Eclipse and does try get close to her, but he is a vampire and she is a human, it was the way jasper's upbringing was that makes him so awkward with her.
Yes, Bella gets the sex talk.
well, I have read the Twilight saga books and yes jasper does play a big part in Eclipse. But he is not the main character. Edward and Bella are, But he does play a big role.
Jasper didnt tell Bella which road to stay on. Jasper was driving and Bella told him the I-10 to get to the airport.
Eclipse He asks her to marry him in New Moon..
they talk about why edward left bella
no Bella will not die in eclipse
well Bella and Edward talk about having a physical relationship in eclipse but in breaking dawn they do have a physical relationship and Bella is prgnant and has her baby
Jasper likes Bella. It's just he has to work hard to control himself.